diff --git a/enveloped-application.json b/enveloped-application.json
index 04990d3..bdeaed4 100644
--- a/enveloped-application.json
+++ b/enveloped-application.json
@@ -37,6 +37,29 @@
             }
           }
         },
+        "callbacks": {
+          "done": {
+            "https://your.site/callback-url": {
+              "post": {
+                "requestBody": {
+                  "required": true,
+                  "content": {
+                    "application/json": {
+                      "schema": {
+                        "$ref": "#/components/schemas/VerificationResult"
+                      }
+                    }
+                  }
+                },
+                "responses": {
+                  "200": {
+                    "description": "Your server returns this code if it accepts the callback"
+                  }
+                }
+              }
+            }
+          }
+        },
         "responses": {
           "200": {
             "description": "OK",
diff --git a/enveloped-application.yaml b/enveloped-application.yaml
index 4d36f77..1817d43 100644
--- a/enveloped-application.yaml
+++ b/enveloped-application.yaml
@@ -34,6 +34,19 @@ paths:
           "application/json":
             schema:
               $ref: "#/components/schemas/EnvelopedApplication"
+      callbacks:
+        done:
+          'https://your.site/callback-url':
+            post:
+              requestBody:
+                required: true
+                content:
+                  application/json:
+                    schema:
+                      $ref: "#/components/schemas/VerificationResult"
+              responses:
+                "200":
+                  description: Your server returns this code if it accepts the callback
       responses:
         "200":
           description: OK